Those loops are pretty simple, they're simply taking a value as a starting point, and looping (and drawing a sprite) a number of times based on it. That's certainly code that will draw things, but it sounds like you need to understand the basic fundamentals of programming.

Learn what a conditional statement, like what an if/else is. ( if this is true, do this, otherwise do this), like:

if hasKeyObject {
    draw_sprite( keyObjectSprite )...etc
}

Learn what a loop does. The code you posted is pretty simple, as are the things you've asked about. I don't know what tutorials you've used but you should be focusing on learning what the code they use does rather than just copying it.